Support for reamer cutters



Dec. 11, 1928. 1,694,870

F. L. SCOTT SUPPORT FOR REAMER CUTTERS Filed Feb. 4, 1928 Fig. 1

W x/wa INVENTOR BY W W ATTORNEY Patented Dec. 11, 1928.

' UNITED STATES PATENT OFFICE.

FLOYD I1 SCOTT, 01E HOUSTON, TEXAS, ASSIGNOR TO HUGHES TOOL COMPANY, OF

HOUSTON, TEXAS, A CORPORATION OF surronr non REAMER ouirrnns.

Application filed February 4, 1923. Serial No. 251,817.

My invention relates to reaming cutters employed in well drilling, and is partlcularly concerned wiihthe-manner 0f mountin the cutter pins in the reamer head.

it is a common custom, in mounting reamer cutters in a drill head, to place the cutters in pockets in the side of the drill head formed between the two' meetin faces of the two sections into which the rill is divided. The difiiculty arising from this method lies in the fact that it is practically impossible to support the ends of the cutter pins between the meeting faces of the head so that there will be no looseness or play in the pins.

It is an object of the invention to provide a secure means of mountin the reamer cutters in a bit head where t e head is longitudinally divided into a plurality of parts.

It is desired that the cutter pins be firmly supported at both ends'and that they also be held against rotation-during the operation of the. tool.l 1

Referring to the drawings herewith, Fig.-

1 is a side elevation of a well drill in which my supporting structure is embodied.

Fig. 2is a transverse section taken on the is of a generally cylindrical form but has channels or grooves 2, in the outer peri her'y to allow passage of flushing fluid'an cuttings. Drill cutters 3, are mounted on the.

forward or lower end to cut the well bore. The u per end of the head is screwed within a drili collar 4, and through bolts 5, secure thg halves of the head adjacent the lower on t The reamin cutters are mounted inpockets 8, forme in the meeting sides of the head. There are preferably two sections to the cutter, a lower section 6, tapered at its lower end and an upper section-7, approximately cylindrical in'shape.

- Each set of cutters is mounted upon a pin 9. To receive said pin one half 10, of the head 1, has bosses 11 and 12, formed on its flattened face at the upper and lower sides respectively ofthe recess ,8, for the cutters. Sald bosses are rounded on their lateral faces in this embodiment '(see Fig. 2)

and the other half of the, head is to receive them. Said bosses are formed openings in the lower boss as shown at 14 in dotted lines in Fig. '1. Thus when the halves of the head are taken apart, the reamer cutters may be laid in the recess 8, and the cutter pin may be introduced through the cutters by placing said in in the groove 14, and moving it longitu inally through the bushing and the cutters against the shoulder 16, at the 11 per end ofthe boss 11. The lower end 0 the pin 9, is cut away on one side to form a shoulder 17, to abut against the shoulder on the head below the boss 12.

It will be noted that the cutters may be quickly and easily mounted on their pins and when the two'halves of the head are fitted together the pins will be firmly supported.'.

The forming of the upper and lower bearings for the pins in bosses inte al withthe head will prevent lay of the pins where the halves of the head wear, and the means of holding the cutter pins in position bycontact of the ends. of the pins with parts of the reamer headassures that the ins and cutters will-not become loose or get 0st in the hole.

Having thus described my invention, what I claim as new is: l

1. A reamer including a head longitudinally divided into a plurality of sections, said sections being formed with cutter pockets in their meeting faces, laterally projecting bosses formed on one of said sections interfitting within recesses on the adjacent section at the upper and lower ends of said pockets, cutter pin bearin s in said bosses, pins in said bearings, an cutters on said pins.

2.A reamer includin a head lon' dinally divided into a p urality of sections, said sections having registering recesses in their meeting faces to receive rotating cutters, bosses on one end of said sections at the upper and lower ends of said recesses, bearings formed in ali ned. openingsiin said bosses, cutter pins a apted to fit within said bearings,-means on said head to hold said ttu- and cutters on said pins.

a. A reamer includin ahead longitutheir meeting faces to receive rotatin'g cutters, bosses on one of said sections at the upper and lower ends ofsaid recesses, bearings formed in ali ed openings in said bosses, cutter pins a apted to fitwithin said bearings, a shoulder on one of said sections above the up er boss and a second shoulder formed on t e adjacent section below the lower, boss inst which said in may contact when said head is assemble and cutters on said pins.

4. In a reamer including a head lon tudinally divided into a. plurality of sections, cutters mounted in pockets in the meeting faces of said sections, pins upon which said cutters are rotatable, supported at their ends in bosses integral with one of -said sections, and shoulders formed on said head adapted to bear against the ends of said pins when said head is assembled to retain said pins against longitudinal movement.

In testimony whereof, I hereunto affix my signature this 25th day of January, A.

FLOYD L. SCOTT. 

